Grinding mill



July 7, 1959 MQs. MlscHANsKl GRINDING MILL 3 Sheets-Sheet 1 Filed Feb.17, 1958 www July 7, 1959 M. s. mlscHANsKl 2,893,649

GRINDING MILL 3 Sheets-Sheet 2 Filed Feb. 17, 1958 INVENxM//////////V/V/V/ July 7, 1959 M. s. MISCHA'NSKI 2,893,649

GRINDING MILL Filed Feb. 17, 1958 3 Sheets-Sheet 3 United StatesPatent() vThis invention relates to aY grinding mill for grinding andpulverizing materials of various character. The 1nventiongparticularly`comprehenlsa. grinding mill for pulverizingmaterial tol avrelativelytine powder.

Another object ofthe invention 4is to provide a grinding mill having agrindingmember rotatably mounted a fixed grindingmembe'r and rotatablycarried by the grinding memberare 'a plurality of conical shapedcrushing cones arranged within the fixed grinding member and adapted forrotation in a direction reverse to that of thev grinding member. Y a.

Y Still .another object of the inventiongis to provide a grinding millofsaid character `in whichthe crushing cones have smooth peripheralfacesrfor crushing material betweenthe Vsame and the' cooperating Vfaceof the fixed grinding member. a ,y V

.Still another object of the'inventionis to provide means for` varyingthe pressure oflthe conical shaped cones against the fixed member.' Y jl. y

' .Still another object of the invention is to provide a grinding millof said character in which the rotatably mounted grinding memberincludes a conical shaped upper portion and a cylindrical shaped lowerportion.

."Still another object of'thev invention is `,to provide a grinding millwhich' is so constructed and arranged as to permit of the convenientremoval orrepl'acement of the parts thereof. Y.

v`rvrith the foregoing andv other vobjects in view, reference isnow madeto the followingspecication and accompanying drawings in whiclivthepreferred embodiments of the invention are illustrated. l

'Invthe'fdrawingrsz .1 Figi ,1 isa vertical sectional constructed inaccordancewiththe invention. 'A Fig'. 2 ,isv 'a horizontalsectionaljview taken approximately on line v2 2- of Fig.. l.,

view ofia grindingrnill i Fig. 3'is a horizontal sectional `view takenapproxil mately on line 3 3 of Fig." 1.

Fig. 4 is a fragmentary vertical sectional view of a grinding millembodying la modifle'dfform ofthe ,invsntionr, Y L1. 1 y' 1 Fig. 5 isaschematic view of hydraulic means for varying the pressure of thecrushingelem'ents.v `f v V Referringto the drawings, the-grinding millillustrated in Figures 1 to` 3 Ainclusive of the drawings includes acylindrical housing 10 supportedby and aiiixed to a support 11 of anydesired character; Arranged within ,the housing 10 isa cylindricalcasing12 which is secured bygscrews 13 or equivalent fastening 'means-toa top housing section 14 and with screws 15 or equivalent fasteningmeans securing the housing section 14ste the housing 10...` y s sArranged below the casing 12vr lisfan` annular member 16to.which.thehousing` lfis'aiiixedby screws..17 .or

equivalent fasteningmeans screws v.18 oreouivalentfa'stening'rneansrigidly fastening theannular member] 16 to( 'the Support '1l-r. The.Casina 12:;CQnstuteS-.a

`Isupport for a yplurality of verticallyspaced'r'ows of teeth 2,893,649Patented July 7, 1959 ice 2 19 arranged with a plurality of the teeth 19in each row disposed in circumferentially spaced relation. The teeth 19are secured in threaded openings 20 in the casing 12 with the inner endsof the teeth projecting radially therethrough.

With the housing 10 is a Vgrinding member 21 atiiiredv to a verticallydisposed drive shaft 22 having a pulley 23 mounted thereon for turningthe same by power means such as electric motor (not shown). The driveshaft 22 is journaled for rotation within a radial bearing 24 mounted inthe top housing section 14 with the lower end of the drive shaft beingenlarged and keyed or otherwise alflxed to a anged sleeve 25 forming theupper end of the grinding member 21. The grinding member 21 alsoincludes a hollow frusto-conical shaped member 26 in which the flangedsleeve 25 is snugly iitted with the flange extending over the topthereof and secured thereto by screws 27 or equivalent fastening means.Secured to the frusto-conical shaped member 26 by screws 28 orequivalent fastening means isY a cylindrical mem-v ber 29 forming a partof the grinding member 21. The cylindrical member 29 is provided with acylindrical bore 30 which opens into enlarged bore portions 31 and 32opening through the top and bottom faces thereof in which are arranged athrust bearing 33 and a radial bearing 34 respectively. Engaging againstthe upper race of the thrust bearing 33 is a head 35of a centrallydisposed shaft 36 mounted for guided reciprocatory movement ina sleeve37 aliixed at its lower end to a bottom section 38 of the housing 10.The upper end of the sleeve 37 is arranged within the inner race of theradial bearing 34.

The grinding member 21 is provided with a plurality of vertically spacedrows of teeth 40 arranged with the teeth in each row disposed incircumferentially spaced relation.' The teeth 40 `are formed on arcuatesectors 41, which sectors are secured to the conical shaped peripheralface of the member 26 by screws 42 or equivalent fastening means. Thecylindrical member 29 is also provided with a plurality of verticallydisposed rows of teeth 43 which are arranged with the teeth in each rowdisposed in circumferentially spaced relation. The teeth 43 are aixed toarcuate sectors 44 secured to the peripheral face of the cylindricalmember 29 by screws 45 or equivalent fastening means. Each of the rowsof teeth 40 and each of the rows of teeth 43 are disposed intermediatetwo of the rows of teeth 19 carried by the casing 12. This constructionpermits of the convenient removal of the sectors 41 and 44 for thereplacement thereof with new teeth.

A particular feature of the invention is the use of a plurality ofconical shaped crushing elements 47 preferably consisting of three suchelements disposed 120 apart and provided with vertically disposed shafts48 each journaled for rotation in radial bearings 49 and 50 arranged ina cylindrical cavity 51 in the cylindrical member 29 and with the upperend of the shaft bearing against a thrust bearing 52. The crushingelements 47 rotate with the rotation of the grinding member 21 and haveindependent rotation in an opposite direction by engagement of theconical shaped faces 54 thereof with the inclined peripheral face 55 ofthe annular member 16. Means is provided for varying the pressure of thecrushing elements 47 against the peripheral face V55. For this purpose,the shaft 36 protrudes through the bottom secv tion 38 of the housing 10and is threadedly engaged by desiredcomminution, a lock nut 57 istightened von the shaft 36 against the nut 56 for maintaining the samein set position. The bottom section 38 of the housing is secured byscrews 58 or equivalent fastening means to the lower end of acylindrical wall 59 forming a receivingehgrnber 6.0 for the ground.materiel which. iS retrieved asf desired threiigh discharge openings 6ltherein` The. eyliridrieal wall 59 is affixed te the cylindrical member16 by screws, 62 er equivalent fastening ineens below the lower end ofthe peripheral face 55.

The top section 14 is provided with a plurality of epenings 64. ierfeeding the material te be ground between the casing 12 and the grindingmember 21. The material is progressively reduced in size as the samepasses downwardly therebetween and upon reaching the peripheral face 55,the partly ground material is subjected to the crushing action of thecrushing elements 47 rotating against the peripheral face 55 so as tonely pulverize the material. It is to be understood that the partlyground material slides down the peripheral face 5,5k between thecrushing elements 47 which rotating with the grinding member 21 crushesthe material to a line powder before the material is discharged into thereceiving chamber 60.

In the form of the invention illustrated in Figures 4 and of thedrawings, the grinding mill is illustrated inits application to a largecommercial mill provided with hydraulic means for varying the downwardpressure of the crushing elements. i

ln this form ot the invention, the grinding mill includes a housing 67aixed to a support 68 and having a grinding member 69 aiiixed tovertically disposed shafts 70 and 71 rotatably mounted in radialbearings 72 and 73 carried by a top housing section 74 and ai'spider 75respectively. The grinding member 69 is similar in constnuction to thegrinding -member 21 in the previous form of the invention and includes ahollow frusto-conical shaped member 78 in which is secured a hangedsleeve 79 to which the enlarged inner end of the shaft 70 is splined.Secured to the frusto-conical shaped member 78 is a cylindrical member80 which forms a part of the grinding member 69 and to which the shaft71 is rigidly axed.

The grinding member 69 is provided with a plurality of vertically spacedrows of teeth 81 formed on arcuate sectors 82 releasably secured to themember 78. The cylindrical member 80 is also provided with a pluralityof vertically disposed rows of teeth 83 atiixed to arcuate sectors 84andthe teeth 81 and 83 are disposed intermediate the rows of teeth 85carried by a cylindrical casing 86 secured within the housing 67.

The grinding member 69 is also provided with a plurality of conicalshaped crushing elements 87 which may consist of any desired number and,asl illustrated, are three in number disposed 120? apart. The grindingmember 69 has vertically disposed shafts 88, each journaled for rotationin radial bearings 89 arranged in a cylindrical cavity 90 in thecylindrical member 80 and with the upper end of each shaft bearingagainst a thnust bearing 91 similar to the arrangement of the crushingelements 47 in the previous form of the invention. V'I-he crushingelements 87 rotate with the rotation of the grinding member 69 and haveindependent rotation in an opposite direction by engagement of theconical shaped faces thereof with an inclined peripheral face 93 of anannular member 94 affixed to the support 68 below the easing S6.

The material to be ground is fed to the mill through openings 95 in thehousing section 74 and is progressively ground by the rotation of thegrinding member 69 and upon reaching the peripheral face 93 is crushedto comminuted form by the action of the crushing elements 87.

The grinding material falls through openings y96 in the` spider 75formed integrally with the annular member 94 and falls into a receivingchamber 97 provided by the cylindrical wall 98. The cylindrical wall 9 8iS aixed by 4 screws or equivalent fastening means to the annular member94 and has a bottom outlet 99.

A particular feature of the invention is the means for varying thepressure of the crushing elements 87 against the peripheral face 93 ofthe annular member 94. This is accomplished by a hydraulic piston 101connected with the shaft 70 by a coupling 102 and with a thrust bearing103 arranged between the upper end of the shaft 70 and the web of thecoupling. The piston 101 is slideably disposed in an opening 104 in thewall of a hydraulic casing 105 aixed to a'head 106 of a tramey support107 mounted on the housing section 74, A tiixed to the inner end of thepiston 101 is a piston head 108 and with openings and 111 for admittingfluid under pressure to opposite sides of the piston head for movementof the piston 101 and shaft 70 in either direction by the pressure ofthe fluid admitted to the casing 105. The piston 101 extends throughy apacking gland 113 for preventing escape 0f the duidtlireiigh the npening104 inthe easing 105..

Hydraulic iiilid is fereed inte the easing 105er either side of thepiston head `108 for varyingA the pressure of the crushing elements 87against the peripheral face 93 by means, di e pump 114 .eeiineeted withi1, manually eper'eted valve 1l5`l1y fluid feed line 1.16 The ,snedenSide ef the pump 1.14 is eenrieeted with e .1117 and e duid return line1.18 extends treni .the valve t0 ,the inlet of the tank 117. The valve11H5 is connected through one service port with the inlet 1,10 by meanso f a fluid line Y119 and through the opposite service port by a fluidline 120 with theA Opening 11.1- Tlie valve is of standard unstructionvand is provided with a manipulating member 121 which when' moved in onedirection supplies` tiuid to the casing 105 through the port 110for'moving the piston head 108 downwardly to increase the pressure ofthe crushing elements 87 against the peripheral face 93. When theoperating member 21 is moved in the opposite direction, huid will llewthrough the inlet 111 remove the Pisten head in .the opposite direction.The line 12,0 operates as a return line when fluid is supplied throughthe line 11.9 and when fluid is Supplied through the lin'e 120, the huidline 11.9 operates as a return line.

It will be understood that the inner race of the radial bearing 24 issplined on the shaft 22 to permit slight movement of the shaft withreference to the bearing when the nut 56 is turned on the shaftA 36 toincrease the pressure of the crushing elements 5,4 against theperipheral face 55. Likewise, in the modied form shown in Figure 4, theinner race of the radial bearing 72 is splined to the shaft 70 to permitof slight relative movement of the shaft 70 whereby the shaft may bemoved downwardly by pressure of the duid in the upper portion of thecasing 105 .i9 thereby increase the pressure of the crushing elements 87against the peripherall face 93.

While the preferred forms of the invention are shown and describedherein, it' is to be understood that the same is not so limited andshall cover and include any and all niedilieatiqnr 0f the inventionWhieh falls within the purview thereof.

What is claimed l- .In a grinding mill., a eylindrieel easing arrangederi a vertieal arie' .and having inwardly Projecting eleniente 011 theinner periphery thereof, e grinding member having eutwardly rreieeting`eleinerits on the outer periph-y ery thereof, raid'grirding memberbeing mediated ier rdtatieri Within reid'earirg ier. breaking up andpulverizing materiel between the elements en said grinding member andcasing, said casing including a lower portion having e Central Openingtherethrough previded with a periph'- eral' inner face ertending-dewnwardly and' inwardly in angular relation'to the vertical anisl ofthe casing, a plurality of radially arranged4 inverted conical shapedmembers, nieiliited en" Sheitr depending frein Said grinding memberierrelative ratei-.ieu` et said. eenieel shared members with reference tosaid grinding member and disposed within the central opening in saidlower portion, each of said'conical shaped members having a narrowportion of its peripheral face disposed in engagement with the innerface of said lower portion with said narrow portions of said conicalshaped members ybeing arcuately spaced apart, and said conical shapedmembers rotating with said grinding member and having independentrotation by engagement-of the peripheral faces thereof with the innerface of said lower portion for crushing material between said conicalshaped members and said lower portion. 2. In agrinding mill, acylindrical casing arranged on a vertical axis and having inwardlyprojecting elements on the inner periphery thereof, a grinding memberhaving outwardly projecting elements on the outer periphery thereof,said grinding member being mounted for rotation within said casing forbreaking up and pulverizing material between the elements on saidgrinding member and casing, said casing including a lower portion havinga central opening therethrough provided with a peripheral inner faceextending downwardly and inwardly in angular relation to the verticalaxis of the casing, a plurality of radially arranged inverted conicalshaped members mounted on shafts depending from said grinding member forrelative rotation of said conical shaped members with reference to saidgrinding member and disposed within the central opening in said lowerportion, each of said conical shaped members having a narrow portion ofits peripheral face disposed in engagement with the inner face of saidlower portion with said narrow portions of said conical shaped membersbeing arcuately spaced apart, said conical shaped members rotating withsaid grinding member and having independent rotation by engagement ofthe peripheral faces thereof with the inner face of said lower portionfor crushing material between said conical shaped members and said lowerportion, and means for applying downward pressure on said grindingmember for varying the pressure of said conical shaped members againstthe inner face of said lower portion.

3. In a grinding mill, a cylindrical casing arranged on a vertical axisand having inwardly projecting elements on the inner periphery thereof,a grinding member having outwardly projecting elements on the outerperiphery thereof, said grinding member being mounted for rotationwithin said casing for breaking up and pulverizing material between theelements on said grinding member and casing, said casing including alower portion having a central opening therethrough provided with asmooth peripheral inner face extending downwardly and inwardly inangular relation to the vertical axis of the casing, a plurality ofradially arranged inverted conical shaped members mounted on shaftsdepending from said grinding member for relative rotation of saidconical shaped members with reference to said grinding member anddisposed within the central opening in said lower portion, each of saidconical shaped members having a smooth peripheral face with a narrowportion of its peripheral face disposed in engagement with the innerface of said lower portion and with said narrow portions of said conicalshaper members being arcuately spaced apart, and said conical shapedmembers rotating with said grinding member and each having independentrotation by engagement of the peripheral faces thereof with the innerface of said lower portion for crushing material between said conicalshaped members and said lower portion.

4. In a grinding mill, a cylindrical casing arranged on a vertical axisand having inwardly projecting elements on the inner periphery thereof,a grinding member having outwardly projecting elements on the outerperiphery thereof, said grinding member being mounted for rotationwithin said casing for breaking up and pulverizing material between theelements on said grinding member and casing, said casing including alower portion havingV a'- icentral" opening .therethrough provided witha rsmooth peripheral inner-'face vextendingdownwardly and inwardly inangular relation tothe vertical axis of the casing, a plurality ofradially arranged inverted conical shaped members mounted on shaftsdepending from said grinding member for relative rotation of saidconical shapedV members with referencel to said grinding members anddisposedy within the central opening in said lower portion, eachofi-said conical "shaped members havingr a smooth peripheralface with a`narrow portion of its peripheral face disposed in engagement with theinner face of said lower portion and with said narrow portions of said`conical shaped'members being arcuately spaced apart, said conicalshaped members rotating with said grinding member and having independentrotation by engagement of the peripheral faces thereof with the innerface of said lower portion for crushing material between said conicalshaped members and said lower portion, and means for applying downwardpressure on said grinding member for varying the pressure of saidconical shaped members against the inner face of said lower portion.

5. In -a grinding mill, a casing including a cylindrical upper portionarranged on -a vertical axis and a lower portion having a centralopening therethrough providing -a peripheral inner face extendingdownwardly and inwardly in angular relation to the vertical axis of thecasing, a grinding member including a frusto-conical shaped upperportion, a cylindrical intermediate portion affixed to saidfrusta-conical shaped upper portion and a plurality of radially arrangedinverted conical shaped members rotatably mounted on shafts dependingfrom said intermediate portion and disposed within the central openingin said lower portion of the casing and having their outer peripheralfaces disposed in narrow engagement with said inner face of said lowerportion, means mounting said grinding member for rotation within saidcasing, said cylindrical portion of said casing and said frusto-conicaland cylindrical portions of said grinding member having cooperatingmeans for breaking up and pulverizing material therebetween with therotation of said grinding member, said conical shaped members rotatingwith said grinding member and having 4independent rotation by engagementof the peripheral faces thereof with the inner face of said lowerportion for crushing the material between said conical shaped membersand said lower portion, and said peripheral inner face of said lowerportion being arranged to receive the pulverized material discharged bygravity from between the intermedi-ate portion of said grinding memberand the cylindrical portion of said casing.

6. In a grinding mill, a casing including a cylindrical upper portionarranged on a vertical axis and a lower portion having a central openingtherethrough providing -a peripheral inner face extending downwardly andinwardly in angular relation to the vertical axis of the casing, agrinding member including a frusto-conical shaped upper portion, acylindrical intermediate portion affixed to said frusto-conical shapedupper portion and a plurality of radially arranged inverted conicalshaped members rotatably mounted on shafts depending from saidintermediate portion and disposed within the central opening in saidlower portion of the casing and having their outer peripheral facesdisposed -in narrow engagement with said inner face of said lowerportion, means mounting said grinding member for rotation within saidcasing, said cylindrical portion of said casing and said frusto-conicaland cylindrical portions of said grinding member having cooperatingmeans for breaking up and pulverizing material therebetween with therotation of said grinding member, said conical shaped members rotatingwith said -grinding member and having independent rotation by engagementof the peripheral faces thereof witlilthe innerface ofAE saidllowerportion for crushing the material? between-,saidconicalsliaped membersand sad lower portion, lsaid peripherallinner face of said lower portionbeing arranged toreceive the pulverized material discharged by gravityfrom between'the intermediate portion ofsaid grinding member an'dthecylindrical portion of" said'casing,. Saidgrinding member having anonroiary shaft operatively connected with the intermediateportionthereo-and cooperating. means carried by said casing and, saidshaftvfor varying the pressure on said shaft tothereby vary thepressureof said` conical shaped members -against-,theinner face of said lowerportion of the, casing.

References Cited in the file of this patent UNITED STATES PATENTS Harrisi Y June 6, 1882 Morris May 4,Y 1897 Day Aug. 6, 1907 Brown June 5, 1945Sharp Jan. 7, 1947 Trayior Mar. 1S, 1949 FOREIGN PATENTS Great Britainof 1883 Canada Nov. 9, 1954 Great Britain Oct. 21, 1953

